amend vs vary

amend

verb
  • To make a formal alteration (in legislation, a report, etc.) by adding, deleting, or rephrasing. 

  • To make better; improve. 

  • To become better. 

noun
  • An act of righting a wrong; compensation. 

vary

verb
  • To institute a change in, from a current state; to modify. 

  • To make of different kinds; to make different from one another; to diversity; to variegate. 

  • To embellish; to change fancifully; to present under new aspects, as of form, key, measure, etc. See variation. 

  • To be or act different from the usual. 

  • Not to remain constant: to change with time or a similar parameter. 

  • To change with time or a similar parameter. 

  • To display differences. 

How often have the words amend and vary occurred in a corpus of books? (source: Google Ngram Viewer )